new ProxyClient("138.68.161.60", 1080, ProxyType.Socks5);
new ProxyClient("138.68.161.60:1080", ProxyType.Socks5);
new ProxyClient("138.68.161.60:1080", "UserID / Username", ProxyType.Socks4);
new ProxyClient("138.68.161.60:1080", "Username", "Password", ProxyType.Socks5);

ClientWebSocket WebSocket = new ClientWebSocket
{
    Options.Proxy = new ProxyClient("138.68.161.60", 1080, ProxyType.Socks4)
};

await WebSocket.ConnectAsync(new Uri("wss://echo.websocket.org"), TokenSource.Token);

HttpClientHandler Handler = new HttpClientHandler
{
    Proxy = new ProxyClient("138.68.161.60", 1080, ProxyType.Socks4),
    Proxy = new ProxyClient("159.224.243.185:61303", ProxyType.Socks4)
    {
        ReadWriteTimeOut = 30000 // 30 seconds [Default 60 seconds]
    }
};

using (HttpClient Client = new HttpClient(Handler))
{
    string Response = await Client.GetStringAsync("https://api.ipify.org/?format=json");

    Console.WriteLine(Response);
}